Expert on Pest PHP testing — syntax, architecture, fixtures, test doubles, dataset providers, and test organization for unit/feature/integration tiers. Use when writing, reviewing, or refactoring tests for the php-api-builder library, or when deciding which tier a test belongs in.
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Install skill "testing-pest" with this command: npx skills add coagus/skillsmp-coagus-coagus-testing-pest
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Expert on relational database design and usage for PHP APIs — especially MySQL 8+, with awareness of PostgreSQL and SQLite differences. Use when designing schemas, choosing column types, adding indexes, writing migrations, writing PDO queries, handling transactions, or debugging slow queries. Covers normalization, index design, charset/collation, JSON columns, and cross-driver portability for the php-api-builder library.
Expert on code quality audit — cyclomatic complexity, SOLID principles, DRY, method/class size, nesting depth, magic numbers, dead code, naming quality, performance smells, and maintainability. Use when auditing a pull request, enforcing quality gates, or deciding whether a change is ready to ship. Designed to be zero-tolerance: any violation becomes a Blocker that triggers a re-do.
Expert on diagrams-as-code for developer documentation. Use when the docs need a flowchart, sequence diagram, ER diagram, state machine, class diagram, or architecture diagram (C4). Primary tool is Mermaid (renders natively in GitHub, Markdown, and most viewers); PlantUML covered in references for advanced cases. Use whenever a doc task mentions "diagram", "flow", "architecture", "entity relationship", "sequence", "state", or when explaining a process visually.
Expert on ORM design patterns and anti-patterns — Active Record vs Data Mapper, identity map, unit of work, eager vs lazy loading, N+1 detection and cure, query builder composition, relationship cascading, scopes, soft deletes, optimistic locking, and performance profiling. Use when writing, reviewing, or optimizing ORM-layer code in the php-api-builder library to produce performant, maintainable data access code.